Method of producing a smart card
First Claim
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1. A method for producing a chip module for a smart card having contacts for communication with external appliances, comprising the steps of:
- forming the chip module by applying at least first and second metal layers on a substrate;
applying a laser beam to the contacts for fusing two of the at least first and second metal layers wherein the fused two of the at least first and second form an alloy, the alloy forming a pattern of visual information on the contacts of the chip module, the pattern of visual information including at least one segment that extends continuously from a first contact to a second contact across an insulating, metal-free interspace therebetween; and
minimizing the application of the laser beam to the insulating, metal-free interspace between the first contact and the second contact to prevent damage thereto when the laser beam is guided over the interspace between the first contact and the second contact while forming the at least one segment of the pattern that extends continuously from the first contact to the second contact.
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Abstract
The invention is a method of producing a chip module for use with a smart card. The chip module is mounted in the smart card and has contacts for communicating with external appliances. The contacts of the chip module include at least two layers which are acted upon by a laser beam to fuse the at least two layers forming an alloy. The alloy forms a pattern of visible information on the contacts.
44 Citations
26 Claims
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1. A method for producing a chip module for a smart card having contacts for communication with external appliances, comprising the steps of:
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forming the chip module by applying at least first and second metal layers on a substrate; applying a laser beam to the contacts for fusing two of the at least first and second metal layers wherein the fused two of the at least first and second form an alloy, the alloy forming a pattern of visual information on the contacts of the chip module, the pattern of visual information including at least one segment that extends continuously from a first contact to a second contact across an insulating, metal-free interspace therebetween; and minimizing the application of the laser beam to the insulating, metal-free interspace between the first contact and the second contact to prevent damage thereto when the laser beam is guided over the interspace between the first contact and the second contact while forming the at least one segment of the pattern that extends continuously from the first contact to the second contact. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method for producing a chip module for a smart card having contacts for communication with external appliances, comprising the steps of:
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forming the chip module by applying at least first and second metal layers on a substrate; applying a laser beam to the contacts for fusing two of the at least first and second metal layers wherein the fused two of the at least first and second form an alloy, the alloy forming a pattern of visual information on the contacts of the chip module; and varying an intensity of the laser beam while guiding the laser beam over the contacts for forming different types of alloys from the at least first and second layers along the path of the laser beam.
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Specification